What has eight strings, a blue quilted-maple veneer and Randy Rhoads’ thumbnail encased in acrylic? Kelly Garni’s new custom bass guitar, a one-of-a-kind homage to his friendship with the dearly departed guitar hero.

Tony Iommi, Randy Rhoads, Jake E. Lee and Zakk Wylde. For more than 20 years, Ozzy Osbourne has seen guitarists come and go. What separates the men from the boys? Guitar World listens as the legendary rock madman spills the beans.